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1.
much like "for real", showing you are serious about something with a little less seriousness.
"So you're serious? Green Day's on tour again?"

"Dude, i am fo shizz"
by littleorphanpunk February 11, 2008
 
2.
the word 'for sure'
but for cool kids
Do you like potatoes?
foshizz.
by MeganB90210 May 12, 2008
 
3.
Short form of the jive word "foshizzle," or white colloquialism "forshizzle," which both mean "for sure."
Dudette: Do you want to go to the free concert?

Dude: Foshizz 'lil mizz!
by ingaling April 09, 2011
 
4.
you understand something and you like it

geezer 1: wonna come to my partay 2nite
geezer 2: fo'shizz
by lawrence bled December 31, 2008